Tone-arm.



l. JONASSON.

TONE ARM. APPLICATION FILED ;AN.6. 1917.

LSUY., Patented July 10, 1917..

ZU( me@ Iyewom types ot records.

facon Jonassen, onions Moines', iowa.

TON 15J-ARM.

Specification of .Letters Patent.

Application tiled January 6, 1917. Serial No. 140,962.

an adjustable tone arnf ot simple and inexpensive construction tor`carrying the sound box oit a talking maelnne.

l `further obgeetis to provide such a tone Varm havingadj ustahle meanstor supporting the sound box whieh earl-ies the stylus, capa-v ble ofadjustment7 so Athat the device may .heused tor playing either type otrecord whether the sound grooves are ot the kind having the" up and downwaves or the kind having the lateral waves, so that in using eitherrecord the record will he carried past the stylus with the. groovetraveling i-n a path atthev point where the stylus engages it, whichis'radial oic the Circle on which 'the stylus swings, so that the styluswill Vnot drag against the side ot the groove.

ilyinvention consists in the eonstruetion, arrangement and combinationotthevarious parts ot the device` wherehy the ohjeets Conteninlated areattained, as hereinatter more fully settorth. pointed out in my claimsand illustrated in the accompanying drawings. in which Figure l shows atop or plan view of my improvedtone arm, the dotted linesA showiiip` thesound box in itsv adjusted position.

l Fig showsa side elevation ot the saine7 theitull lines showing thesound holt in one of its adjusted positions, and the dotted linesshowing it in-an'ot-her position, and

Fig. 3 `shows a side elevation ot' the tone arm with. the sou/nd boxadjusted tor use with a dilterent type of record. the dotted linesshowing the sound box in an adjusted position.

It may he explainedin a preliminary wav thatv there are a nuniher ottone arms having the sound box adjustahly mounted thereon, on a sort ofcrank arin tor adji'istiuent to positions for playing either ot thecommon The diliieuity involved in the use ot suoli an adjustable tonearm arises `from the fact tl at if the tone arm is properlyv adjustedtor use with one type ot record. then when it isy swung on its crankarui support quarter revolution, the stylus. instead ot' travelingsmoothly in the groove ot`tlie portion l-e extending upwardly andsound'loox '1st, which Carries the record, will tend to drag against theside thereof. This dillieulty i have souaht to solve hy my constructionherein shoiin.

In `the aeconipanying drawings. l have used the reference numeral l-f'lto'iiidieate generally a tubular anni forming partvotl my improved tonearni.- ilidaliilv tatablymounted in the end ot the tube l() is a tubulartone arm member li lui-vine` atits .forward end a portion l2, whichini'one position. et the device. extends downwardly and away :from thetuhular nieuiher lO. i

:it the lower end of thev extension l2 is a awav from the portion l2 atsulistantiallv .rightiangles thereto, and supporting an firdiiiary ustylus or needle le I Formed in the tubular nieinher l0 is aeircuinterentially elongated slot lo. EX tending rearwardly and slightlydownwardlv from the slot 1G is a slot 1S at the rear end lot which is anupward extension lf) on the horizontal level with the upper end ot' theslot 1G. I

The portion 12 is iliade of two parts telestopieally connected. thelower portion heing eapa'hle ot limited rotary motion with,

relation to the upper portionl 4 The lower portion isprovided with a pin2() whieh travels in a rireuniterentially elongated slot in the upperportionto permit a vpiarter revolution ot the lower portion oli the partl2 with relation tothe upper portion thereof.

in Fig. l. I have shown a record disk 22. having the sound grooves 23, y

ltwill he understood that in Aordinz'iiv talking machines, the tone armma v lie swung horizontally and in Fig. l, .l 'have shown the line 2l toindicate the are ot a eirele on which the stylus la travels during suchhorizontal swinging movement ofthe' tone arm.

In this connection it ma)y he stated that the tone arm and stylus shouldhe so eoiistruoted and arranged and. located with relation to the recorddisk ""2 that the sound groove 23, in which the stylus is traveling.will at the point where the stylus lori-ated, always he travelingsubstantially in a line radially of the Circle oi which the line formsan are lWhen this eoiistruetion is followed, the stylus will never dragaiguii-ist the side of the sound groove. The line 2li passes through theCenter ot the disk.

Retords are made generally of two types and iop in which the soundgroove has up and down waves-or lateral waves. It is desirable that tonearms be supplied with which either lrecord may be played.

-the stylus is in proper position with rela-r` tion for properly playingone type of disk, it will be seen that when a, quarter turnis vgiven tothe sound box in the lower portion of the member 12, the stylus, insteadof being then in the proper position with l'relation tothe grooves ofthe record, will lso be in posi-tion so that it tends to drag against`the side of the sound wave groove.

'n Fig. 1, I have shown in full lines a stylus in propeinpositionl forplaying the record having the up and down siind wave grooves.

If then it is, desired to play records hav-v ing the other type tgrooves, and the lower part of the memberv 12 turned a, quarterrevolution, it will be seen `that the stylus would then be in the vline25 and would t'iid to drag against thetside of the groove.4 `.It thetone. arm were?adjusted dr constructed so that \\'lien'-iii.tlieposition shown 'in Fig. 3. the styl'iisbwou/ld be located in aline 2,then it' the portion V1i were .given a quarter turn, bringinff the'soundbox to the positions showin in 1 and 2, the stylus would be in the'line-26 and wouldy tend to drag against the side of the sound I have.therefore, constructed my tone arm` as shown, so that. when the soundbox isgiven a quarter turn .tiom'tlie position Shown in F ig. 1,to 'ftheposition shown lin -Fig 3, the member 11 may be vpushed out Wardly fromits positionssliown in'Figs. 1 and 2 to posi'tion shown in Fig. 3, so,vthat the stylus may, in both positions of the soundbox, and for playingboth st vles of records, be in' the linelfffhe extension simpleconstruction 'and permits 19 serves vto locltthe member 11 againstlongitudinal sliding movement f during the operationof the machine. n,My improved device ot extifeiiiel'y fthe'lomid tion of" the st vlus atall times in proper position with. relation to the record..

Sonie changes may be madein the yconstruotionand arrangement ot in vimproved f I In a playing arm having a reproduc- 'tube whereby the twoends/0f the longidevice, without departing -froin the essen'- t-ialfeatures and purposes of my invention', and it is my intention to coveiiby my present application any such changes in con,A p struction or useof lmechanical equivalents which may be includedl within the reasonablescope of the claims of my patent;v

. I claim as my invention:

1. In a device of thevlclass described, a tubular, two part tone armhaving the `tor-, ward portion telescopic-ally received within therearward portion; the rearward portion having an L shaped slot thereinwith an engaging notch at the rear end of the longitudinal arm of saidslot, a pin mounted 'on the forward portionof saidarm' andadapted tocoact with said slot whereby the movable'() portion of the tone arm maybe moved lon'gi'- tudinally7 between two predetermined p`ositions andmay also be rotated relative to the stationary portion of the tone arm.i

2. In a devicevot the' class described,` 4a horizontally disposed tubeadapted to form a part of a tone arm having a substantially L shapedslot therein, the longitudinal portion of the slot havinganengagingnotch. at one end and being inclined upwardly from said notch,asecond"`tube adapted .to be telescopically received inthe `first, and apin fixed in the last tube andadapted to be received in the slot in thefirst tube where-s by the second tube may be permitted loiigi- 95tudinal movement rela'tive to thel tirst tube' between two predeterminedlimits and rotary movement from one ot its-longitudinal positions.

ing mechanism thereon adapted-v to coperate with reco-rds of'both theundulating and lateral wave types, a Hxed tube having a longitudinalslot therein' inclined upwardly toward the free end and provided ptitsother end with an upwardly extending notch. the upper'Y end of thelongitudinal slot being extended circumferentially otl the` tudinalportion of the slot `are adapted to 110 cooperate with a pin to lock`t/lie pin in position, a second vtube adapted to be slidably androtatably received.\'vitliiii the first tube andto have lthe reproducingii'iech'anism sef cured to its ktree end. and a pin extended pinis at aposition adjacent to the upper end of `the. longitudinal portion of' theslot, Desfllfoiiies, I owa. December 26, 191.6!!

